100Hz繰り返し100mJ高輝度マイク口MOPA (Master Oscillator Power Amplifier)

摘要

Micro-MOPA, which is a master oscillator power amplifier system with a microchip-based sub-ns laser and a beam cleaning gain aperture, can generate extremely high brightness of 18 PW/sr·cm~2 with 200-mJ pulses. However, the current repetition rate of the Nd:YAG-rod amplifier in our Micro-MOPA was limited to 10 Hz due to its thermal problems under high power operation. In this work, we achieved 100-Hz operation in a PW/sr·cm~2-class Micro-MOPA by optimizing the optics from the evaluation of the thermal lens effect in a highly excited Nd: YAG-rod of Micro-MOPA.